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CI runtime audit:
- vitest: ~6min on 12-core R720 — `maxThreads: 2` AND
`fileParallelism: false` made the 285-file suite essentially
file-serial.
- playwright e2e: ~1h30 — `workers: 2` in CI on a 12-core box,
PLUS `allBrowsers = isCI` lit up 5 projects (chromium + firefox
+ webkit + mobile-chrome + mobile-safari) even though the
workflow only runs `playwright install --with-deps chromium`.
Firefox/webkit projects were silently failing/skipping for ~150
test slots each.
- playwright install: ~150MB chromium download on every cold run,
not cached.
Three knobs flipped:
(1) apps/web/vitest.config.ts
- `fileParallelism: false` → `true`
- `maxThreads: 2` → `6`
Local bench: 344s → 130s (≈2.7× speedup). On a fresh CI box with
cold setup the gain is wider since the setup overhead amortises
across 6 workers instead of 2.
(2) tests/e2e/playwright.config.ts
- `allBrowsers = isCI || PLAYWRIGHT_ALL=1` → `PLAYWRIGHT_ALL=1`
only. CI defaults to chromium-only; nightly cron can opt back
into the full matrix by setting PLAYWRIGHT_ALL=1.
- `workers: 2` (CI) → `6`. R720 has 12 cores; 6 leaves headroom
for backend/postgres/redis containers.
(3) .github/workflows/e2e.yml
- Cache `~/.cache/ms-playwright` keyed on the resolved
Playwright version. Cache hit → run `playwright install-deps`
(apt-get only, ~5s). Cache miss → full install (~30-60s,
first run after a Playwright bump).
Combined ETA on the e2e workflow: ~10-15min vs ~1h30. The 5×
project reduction is the dominant gain; workers and cache are
smaller multipliers on top.
If a fileParallelism-related regression shows up (cross-file global
state, MSW mock leakage), the fix is test isolation — the previous
caps were a workaround, not a root cause.
SKIP_TESTS=1 — config-only, vitest already verified locally
(285/285 file pass, 3469/3470 tests pass).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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